PyPortal View Master Created by Ruiz Brothers. Last updated on :51:28 AM UTC

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1 PyPortal View Master Created by Ruiz Brothers Last updated on :51:28 AM UTC

2 Overview In this project we re building a view master inspired device using Adafruit s PyPortal. The eyepiece makes the viewing experience feel immersive and novel. When you pull the down on the crank, it goes through the image on the screen like a slideshow. The mechanism uses a compression spring so it can spring back when it s released. The case design is 3D printed and uses fasteners to secure all the components in the assembly. For portability it uses PowerBoost and battery. Adafruit Industries Page 3 of 25

3 Inside are pieces of Conductive Nylon Tape that close a switch when the crank is pulled. Code is written in Circuit Python and uses Adafruit s libraries to make a slideshow. Use the Adafruit PyPortal libraries to display bitmap images from either the internal storage or micro SD card. The images actually fade in and out when cycling through them so it makes for nice and smooth effect. Adafruit Industries Page 4 of 25

4 Parts List Adafruit PyPortal () Adafruit PowerBoost 1000C ( 3.7v 2000mAh lipo battery ( Slide Switch ( 2x 3-pin JST cables ( Conductive Nylon Fabric Tape (5mm wide / 10m) ( Mini Oval Speaker ( (optional) Compression Spring 5/16x1 1/2 x.02" (7.9x38x.5mm) Cut 20.5mm short 4x M3x16mm (for EyePiece Assembly) 4x M3x10mm (for PyPortal Assembly) 4x M3x5mm (for Lid Assembly) 4x M2.5x5mm (for PowerBoost) Adafruit Industries Page 5 of 25

5 Adafruit PyPortal - CircuitPython Powered Internet Display $54.95 OUT OF STOCK OUT OF STOCK PowerBoost 1000 Charger - Rechargeable 5V Lipo USB 1A $19.95 IN STOCK ADD TO CART Lithium Ion Battery - 3.7v 2000mAh $12.50 IN STOCK ADD TO CART Breadboard-friendly SPDT Slide Switch $0.95 IN STOCK ADD TO CART Adafruit Industries Page 6 of 25

6 JST PH 3-Pin to Male Header Cable - 200mm $1.25 IN STOCK ADD TO CART Conductive Nylon Fabric Tape - 5mm Wide x 10 meters long $2.95 IN STOCK ADD TO CART Adafruit Industries Page 7 of 25

7 Circuit Diagram This provides a visual reference for wiring of the components. They aren't true to scale, just meant to be used as reference. This diagrams was created using Fritzing software ( Circuit Diagram The 2-pin JST cable from the battery connects directly into battery port on the PowerBoost 1000C. Voltage and Ground wires from the PowerBoost 1000C connect to the 3-pin JST port on the PyPortal (doesn't matter which one). 5V/VCC pin from PowerBoost 1000C to 3-pin JST(VCC) on PyPortal GND from PowerBoost 1000C to 3-pin JST(GND) on PyPortal EN from PowerBoost 1000C to switch GND from PowerBoost 100C to switch Slide Switch Use a 2-wire cable (110mm long) to connect the slide switch to the PowerBoost. Remove a bit of insulation from the tips of the wire and tin them with a bit of solder. Connect the wires to the middle pin and either the far left or right pin on the switch. A third helping hand tool can hold the switch and wire in place while soldering. Connect JST Cable Adafruit Industries Page 8 of 25

8 We'll use a 3-pin JST cable (9cm long) to easily connect the PowerBoost to the PyPortal. We only need two of the three wires, so you can remove the white wire. Using wire strippers, remove a bit of insulation from the tips of the wire and tin them with a bit of solder. Solder the wires to the voltage (+) and ground ( ) pins on the USB output of the PowerBoost. Adafruit Industries Page 9 of 25

9 Code CircuitPython Setup Your Adafruit PyPortal should already come with CircuitPython but maybe there's a new version, or you overwrote your board with Arduino code! In that case, see the below for how to reinstall or update CircuitPython. Otherwise you can skip this and proceed with the build. Install Libraries for CircuitPython Use the link below to download the Adafruit CircuitPython Library Bundle. Download the adafruit-circuitpython-bundle- 4.x-mpy-*.py bundle zip file, and unzip a folder of the same name. Inside you'll find a lib folder. You have two options: You can add the lib folder to your CIRCUITPY drive. This will ensure you have all the drivers. But it will take a bunch of space on the 8 MB disk Add each library as you need it, this will reduce the space usage but you'll need to put in a little more effort. At a minimum we recommend the following libraries, in fact we more than recommend. They're basically required. So grab them and install them into CIRCUITPY/lib now! adafruit_pyportal adafruit_imageload adafruit_slideshow adafruit_sdcard adafruit_bus_device neopixel.mpy Images on internal flash The code looks for an "images" folder on the CIRCUITPY drive by default. If it can't find any there, it'll search for images Adafruit Industries Page 10 of 25

10 on the SD card. Images on SD Card If no images are on the internal storage, the code will search on the microsd card. The microsd card must be FAT32 and contain a folder named "images". Image file names can be titled arbitrarily but avoid using special characters, hyphens and the sort. Your images must be in the following format and resolution. Images must be 320 x 240 pixel 24-bit color.bmp files Download our sample image pack to get you started! Upload code Copy the python code below and paste it into a text document, then save it to the CIRCUITPY drive. import os import board import busio import digitalio import storage import adafruit_sdcard from adafruit_slideshow import PlayBackOrder, SlideShow, PlayBackDirection # Default location to look is in internal memory IMAGE_DIRECTORY = "/images" switch = digitalio.digitalinout(board.d3) switch.direction = digitalio.direction.input switch.pull = digitalio.pull.up spi = busio.spi(board.sck, MOSI=board.MOSI, MISO=board.MISO) cs = digitalio.digitalinout(board.sd_cs) try: sdcard = adafruit_sdcard.sdcard(spi, cs) vfs = storage.vfsfat(sdcard) storage.mount(vfs, "/sd") IMAGE_DIRECTORY = "/sd/images" except OSError as error: print("no SD card, will only look on internal memory") def print_directory(path, tabs=0): for file in os.listdir(path): stats = os.stat(path + "/" + file) filesize = stats[6] isdir = stats[0] & 0x4000 if filesize < 1000: sizestr = str(filesize) + " by" elif filesize < : Adafruit Industries Page 11 of 25

11 elif filesize < : sizestr = "%0.1f KB" % (filesize / 1000) else: sizestr = "%0.1f MB" % (filesize / ) prettyprintname = "" for _ in range(tabs): prettyprintname += " " prettyprintname += file if isdir: prettyprintname += "/" print('{0:<20} Size: {1:>6}'.format(prettyprintname, sizestr)) # recursively print directory contents if isdir: print_directory(path + "/" + file, tabs + 1) try: print_directory(image_directory) except OSError as error: raise Exception("No images found on flash or SD Card") # Create the slideshow object that plays through once alphabetically. slideshow = SlideShow(board.DISPLAY, None, folder=image_directory, loop=true, order=playbackorder.alphabetical, dwell=0) while True: if not switch.value: print("click!") slideshow.direction = PlayBackDirection.FORWARD slideshow.advance() while not switch.value: pass Adafruit Industries Page 12 of 25

12 3D Printing 3D Printed Parts Parts are designed to be 3D printed with FDM based machines. STL files are oriented to print "as is". Parts are listed below with file name and description. Parts require tight tolerances that might need adjusting slice setting. Reference the suggested settings below Adafruit Industries Page 13 of 25

13 Slice Settings Use these settings as reference. Values listed were used in Ultimaker's CURA 3.X slicing software. 0.2mm Layer Height / 0.4mm nozzle 0.35mm Line Width (inner & outer widths) 60mm/s printing speed 20% infill Supports: Yes Cura Support Blockers We added support blockers to the four standoffs on the Frame part, since we'll only need supports under the roof of the slide switch geometry. We can lower the support destiny to 10% using a zigzag pattern to make removal easier. Support Removal To remove the supports, we used tweezers to fit between the zigzag pattern to grip and pull the supports away. Adafruit Industries Page 14 of 25

14 Adafruit Industries Page 15 of 25

15 Assemble Crank Assembly First we'll start by assembling the crank that acts as a switch to advance to the next photo. Lay the Crank part inside the groove in the Crank-Holder part. Attach Spring Cut a 5/15"x1 1/2x.02" (7.94mmx38x.5mm) spring compression to 20.5mm in length. Next carefully bend one of the ends flat. Pass the end through the ring on the Crank part as shown in the picture. Now we can attach the other end to the Crank Holder. Rotate the spring and Crank assembly to pass the end of the spring into the hoop on the Crank Holder. Test the spring back action. Make sure the spring doesn't block the crank from rotating. Adafruit Industries Page 16 of 25

16 Eyepiece Layers Next we'll sandwich the three layers that will holder the crank assembly in place. Align the Eyepiece part with the Eyepieceside and Crank assembly. Use the Crank parts center nub to align with the Eyepiece. Insert the post on the Crank into the cavity on the Eyepiece. Note the orientation of the Eyepiece-Side fits together with the cutaway on the Crank Holder. Fasten with together with four M3x16mm long screws. Adafruit Industries Page 17 of 25

17 Build Crank Switch The switch is made with the use of conductive nylon tape. When the crank rotates, one contact meets with the other contact. This triggers the PyPortal to advance to the next picture. We'll use two strips of conductive nylon tape to attach the GND and D4 pins to the Crank and Crank Holder parts. Attach Nylon Tape We'll measure two strips of Conductive Nylon tape about 14mm long and wrap about 2/3 the length around each of pins ends. Stick the remaining length to the Crank and the other pin to the Crank Holder as shown in the picture. Assemble PowerBoost1000C Now we can move on to adding our connections for the Slide Switch and Power wires for the PyPortal. For the slide switch, we'll measure and cut two wires 110mm long. For power out, cut off the jumper pin ends and tin and solder the wires to the + and - pads on the PowerBoost. We used silicone wire ( to make bending them around components easier. Adafruit Industries Page 18 of 25

18 Mount PowerBoost Align the PowerBoost to the standoffs inside the Frame part. Oriente the USB port so it faces the edge of the frame. We used four M2.5x5mm long screws to secure the PowerBoost to the Frame. Adafruit Industries Page 19 of 25

19 Mount Slide Switch Make sure to first remove the supports inside the slide switch mount. The slide switch press fits into the mounts inside the Frame part. Place the slide switch at an angle and press fit into place. Speaker Mount We can optionally mount an oval speaker to the opposite wall inside the Frame part. To mount, first peel the sticker from the ring around the front of the speaker, orient so the wires face closer to the slide switch, angle and press into place. Adafruit Industries Page 20 of 25

20 Attach Lid Next we'll mount the Lid part to the Frame. Align the Lid so the slot for the slide switch matches on the Frame. We used M3x5mm screws to secure the Lid to the Frame. Route Wires The wires from the Powerboost can pass through the slot on the Lid part and into the PyPortal. Position the wires so they lay down and don't obstruct the screen. Adafruit Industries Page 21 of 25

21 Mount Battery Next we'll mount our battery to the Frame. We used a small piece of foam tape to secure it. Orient the battery so the wires are facing the PowerBoost. Position the battery in the center of the Frame part, but with enough space away from the slide switch. Connect the battery to the JST port on the PowerBoost. We can flip the switch off if it turns on. Adafruit Industries Page 22 of 25

22 Attach PyPortal Moving on to mounting the PyPortal. Lay the PyPortal with the screen facing towards in the inside of the Frame. Oriente so the ports on the PyPortal face the PowerBoost cable. The standoffs with the cut aways only align with the correct standoffs on the PyPortal. Add Cover Now we'll lay the Cover part on top of the PyPortal. Align the Cover part so the Rest button and Port openings match. We'll use four M3x10mm long screws to fasten the Cover to the PyPortal and Frame parts. Adafruit Industries Page 23 of 25

23 Attach Frame to Eyepiece Final stretch! We can now move on to attaching the Eyepiece assembly to the Fame assembly. Align the Eyepiece assembly with the Crank on the same side as the PowerBoost. Pass the conductive switch wires through the slots on the Lid and position the wires so they lay down and don't obstruct the display. Adafruit Industries Page 24 of 25

24 Test Switch Before we mount the Eyepiece assembly, we'll go ahead and switch on the PyPortal to test out the switch and adjust the Conductive Nylon Tape if needed. We can move the conductive nylon tape closer to the "end stop" if the Crank gets stuck during rotation. Complete Slide the switch on and try out the slideshow! Adafruit Industries Last Updated: :51:28 AM UTC Page 25 of 25

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